13 November 2014 Cost-effective and full-field method for measuring vibration of loudspeaker membrane using fringe projection
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Abstract
We proposed a cost-effective and full-field method for measuring vibration of loudspeaker using general industrial camera and fringe projection. The loudspeaker is excited by a sinusoidal signal. The fringe pattern is projected on the measured loudspeaker membrane that is dynamically deformed. Then the deformed fringes are captured by a camera. A trigger generation circuit is designed to control the camera. The Fourier Transform Profilometry (FTP) is adopted for 3D shape reconstruction. The validity of this method is approved by experiments. The cost of proposed measurement system is dramatically lower than that using high-speed camera.
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Jian Wang, Yong Li, Zhiliang Zhang, Peng Gao, "Cost-effective and full-field method for measuring vibration of loudspeaker membrane using fringe projection", Proc. SPIE 9276, Optical Metrology and Inspection for Industrial Applications III, 92761M (13 November 2014); doi: 10.1117/12.2071281; https://doi.org/10.1117/12.2071281
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